WO2010046764A1 - Divided wall columns for smaller sized plants - Google Patents

Divided wall columns for smaller sized plants Download PDF

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Publication number
WO2010046764A1
WO2010046764A1 PCT/IB2009/007199 IB2009007199W WO2010046764A1 WO 2010046764 A1 WO2010046764 A1 WO 2010046764A1 IB 2009007199 W IB2009007199 W IB 2009007199W WO 2010046764 A1 WO2010046764 A1 WO 2010046764A1
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WO
WIPO (PCT)
Prior art keywords
wall
column
divided
cylindrical
exchange column
Prior art date
Application number
PCT/IB2009/007199
Other languages
French (fr)
Inventor
Kenneth William Kovak
Original Assignee
Air Products And Chemicals, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Air Products And Chemicals, Inc. filed Critical Air Products And Chemicals, Inc.
Priority to EP09744453.3A priority Critical patent/EP2340094B1/en
Priority to CN200980141519.9A priority patent/CN102186548B/en
Publication of WO2010046764A1 publication Critical patent/WO2010046764A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/14—Fractional distillation or use of a fractionation or rectification column
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/14—Fractional distillation or use of a fractionation or rectification column
    • B01D3/141—Fractional distillation or use of a fractionation or rectification column where at least one distillation column contains at least one dividing wall
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04866—Construction and layout of air fractionation equipments, e.g. valves, machines
    • F25J3/04896—Details of columns, e.g. internals, inlet/outlet devices
    • F25J3/04903—Plates or trays
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04866—Construction and layout of air fractionation equipments, e.g. valves, machines
    • F25J3/04896—Details of columns, e.g. internals, inlet/outlet devices
    • F25J3/04909—Structured packings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04866—Construction and layout of air fractionation equipments, e.g. valves, machines
    • F25J3/04896—Details of columns, e.g. internals, inlet/outlet devices
    • F25J3/04915—Combinations of different material exchange elements, e.g. within different columns
    • F25J3/04921—Combinations of different material exchange elements, e.g. within different columns within the same column
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04866—Construction and layout of air fractionation equipments, e.g. valves, machines
    • F25J3/04896—Details of columns, e.g. internals, inlet/outlet devices
    • F25J3/04933—Partitioning walls or sheets
    • F25J3/04939—Vertical, e.g. dividing wall columns

Definitions

  • the present invention relates to divided wall technology and provides an apparatus and method for facilitating the use of divided wall technology with smaller column diameters than are currently manufactured or used.
  • the temperature differences create significant mechanical stresses on both the dividing wall as well as the pressure shell column, and as such, have to be carefully monitored and managed during plant operation.
  • the pressure and temperature differences especially are significant during operating upsets, for example, during the startup or shut down of the facility.
  • upset conditions can be especially problematic when the operating temperatures of the column system deviate substantially from ambient conditions.
  • an air separation column operates under cryogenic conditions with temperatures reaching -195°C. At that temperature, care must be taken while cooling down the columns to ensure that both sides of the columns are cooled at a uniform rate (i.e., to prevent one column from cooling at a rate much faster than the opposite side of the column).
  • the problem to which the present invention is directed is to provide an apparatus and method facilitating the use of divided wall technology with the specific advantage of providing for the production of smaller column diameters than are currently manufactured or used.
  • the invention provides a divided exchange column comprising a cylindrical shell having a longitudinal axis and divided into two or more longitudinally extending part-cylindrical internal columns characterized in that each of said internal columns is discretely preformed and has a respective part-cylindrical wall adjacent the cylindrical shell and terminating in two longitudinally extending edges and closed between said edges with one or more side walls.
  • the invention provides a method of constructing a divided exchange column of the first aspect comprising inserting into a cylindrical shell having a longitudinal axis two or more discretely preformed longitudinally extending part-cylindrical internal columns each having a respective part-cylindrical wall adjacent the cylindrical shell and terminating in two longitudinally extending edges and closed between said edges with one or more side walls.
  • two complementary, preferably semi-cylindrical, internal columns each having the part-cylindrical wall closed along its open side with a substantially flat chordal side wall.
  • Opposed side walls of adjacent internal columns can be spaced apart or in contact.
  • the internal columns can contain distillation trays or structured packing. At least one of the internal columns can comprise at least one distillation tray and at least one other internal column can comprise structured packing. If an internal column contains distillation trays, the trays preferably do not directly contact the interior surfaces of the column but, for example, are arranged in a self supporting stack that hangs from the top of the column. At least one of the internal columns can be secured at its top to the shell and/or at least one of the internal columns can be secured at its bottom to the shell and/or at least one of the internal columns can be secured to the shell by a shear ring.
  • At least one of the internal columns can be of smaller cross section than at least one other internal column and/or can be of shorter length than at least one other internal column.
  • a divided exchange column includes a cylindrical shell column having a first longitudinal axis and a cylindrical wall spaced apart from and surrounding the first longitudinal axis, thereby defining a first interior space between the cylindrical wall and the first longitudinal axis, wherein the cylindrical wall comprises an inner surface and an outer surface; a first divided wall column having a second longitudinal axis substantially parallel to the first longitudinal axis, a first wall, and a second wall, where the first wall of the first divided wall column is coupled to the second wall of the first divided wall column, and where the first wall of the first divided wall column is substantially flat and the second wall of the first divided wall column is substantially semi-cylindrical; a second divided wall column having a third longitudinal axis substantially parallel to the first and the second longitudinal axes, a first wall, and a second wall, where the first wall of the second divided wall column is coupled to the second wall of the second divided wall column, and where the first wall of the second divided wall column is substantially flat and the second wall of the second divided wall column is substantially
  • the first wall of the first divided wall column and the first wall of the second divided wall column can define a slot therebetween, said slot extending from the first longitudinal axis to the inner surface of the cylindrical shell.
  • the first divided wall column has a first length
  • the second divided wall column has a second length. The first length of the first divided wall column and the second length of the second divided wall column may not be equal, for example.
  • the shell column may be pressurized or under vacuum conditions.
  • the thickness of the first wall of the first divided wall column may be 3 mm to 20 mm.
  • the first divided wall column may comprise at least one distillation tray and the second divided wall column comprise structured packing.
  • a divided exchange column includes a first wall, where the first wall is substantially flat, a second wall, where the second wall is substantially semi-cylindrical and where the first wall and the second wall are coupled together such that the first wall and the second wall form a first exchange column with a cross-section that is substantially semi-cylindrical, a third wall, where the third wall is substantially flat, a fourth wall, where the fourth wall is substantially semi-cylindrical and where the third wall and the fourth wall are coupled together such that the third wall and the fourth wall form a second exchange column with a cross-section that is substantially semi-cylindrical, and a fifth wall, where the fifth wall is substantially cylindrical and forms a shell around the first exchange column and the second exchange column, and where the first wall of the first exchange column is adjacent and spaced from the third wall of the second exchange column.
  • a divided exchange column comprises a first wall, where the first wall is substantially flat; a second wall, where the second wall is substantially semi-cylindrical and where the first wall and the second wall are coupled together such that the first wall and the second wall form a first exchange column; a third wall, where the third wall is substantially flat; a fourth wall, where the fourth wall is substantially semi-cylindrical and where the third wall and the fourth wall are coupled together such that the third wall and the fourth wall form a second exchange column; and a fifth wall, where the fifth wall is substantially cylindrical and forms a shell around the first exchange column and the second exchange column, and where the first wall of the first exchange column is adjacent and spaced apart from the third wall of the second exchange column.
  • Figure 1 is a schematic diagram illustrating a traditional divided wall column
  • Figure 2 is a schematic diagram illustrating an exemplary embodiment of the present invention
  • Figure 3 is a schematic diagram illustrating an exemplary embodiment of the present invention.
  • Figure 4 is a schematic diagram illustrating an exemplary embodiment of the present invention.
  • Figure 5 is a schematic diagram illustrating an exemplary embodiment of the present invention
  • Figure 6 is a schematic diagram illustrating an exemplary embodiment of the present invention
  • Figure 7 is a schematic diagram illustrating an exemplary embodiment of the present invention.
  • Figure 8a is a schematic diagram illustrating an exemplary embodiment of the present invention.
  • Figure 8b is an enlarged cross-sectional schematic diagram of an exemplary embodiment of the present invention.
  • Figure 9a is a schematic diagram illustrating an exemplary embodiment of the present invention
  • Figure 9b is an enlarged cross-sectional schematic diagram of an exemplary embodiment of the present invention
  • Figure 10a is a schematic diagram illustrating an exemplary embodiment of the present invention.
  • Figure 10b is an enlarged cross-sectional schematic diagram of an exemplary embodiment of the present invention
  • Figure 11 is a schematic diagram illustrating an exemplary embodiment of the present invention.
  • Figure 1 illustrates a known traditional divided wall column 10 where a dividing wall 20 is welded to column 30.
  • Figure 2 illustrates an embodiment of present invention where separate preformed divided wall columns 40, 50 may be constructed for use in a shell column 60.
  • the shell column 60 may be pressurized, for example.
  • the shell column 60 may also be under vacuum conditions, for example.
  • the diameter of the shell column 60 may vary.
  • the diameter of the shell column 60 may be designed as a function of the design pressure.
  • the shell column 60 may be cylindrical or substantially cylindrical, for example.
  • the divided wall columns 40, 50 may be semi-cylindrical or substantially semi- cylindrical, for example.
  • the divided wall columns 70, 80, 90 may also be substantially pie-shaped or substantially sectorial, for example, such that one or more divided wall columns may be positioned inside a shell column 60.
  • a planar or flat wall 42, 52 of the divided wall column 40, 50 may be welded to the semi-cylindrical wall 44, 54 of the divided wall column 40, 50 from outside the divided wall column 40, 50. Space restrictions that occur when working from the inside of the divided wall column 40, 50 may be eliminated because the welding may be performed from outside the divided wall column 40, 50.
  • the thickness of the flat wall 42, 52 may vary. The flat wall 42, 52 thickness may be 3 mm to 20 mm, for example.
  • each divided wall column 40, 50 (or 70, 80, 90 in
  • FIG 3 may have distillation trays 100 or packing 110 installed as appropriate.
  • Distillation trays 100 disclosed in U.S. Patent No. 7,234,691 , which is herein incorporated by reference in its entirety, may be used, for example.
  • the trays 100 do not directly contact the interior walls of the divided wall column as they may be installed as a stack of self-supporting trays that hang from the top, for example.
  • Each divided wall column may be separately installed into the shell column 60, for example.
  • the divided wall column may be secured to the shell column
  • the divided wall column may be secured to the shell column 60 at the bottom 130 of the divided wall column, for example.
  • a shear ring 140 may be used to affix the divided wall column to the shell column 60, for example.
  • telescoping shoes or spacers 150 may be used to fix the relationship of the divided wall columns to the shell column 60 and each other.
  • Manufacturing the divided wall columns 40, 50, as illustrated in Figure 2, for example, may diminish the effect of the mechanical stresses created by the pressure and temperature differences that typically occur on either side of the dividing wall because the two divided wall columns no longer share a common dividing wall 20, as illustrated in
  • the divided wall columns 40, 50 may be positioned apart such that an open space or slot 170 may be defined between the substantially flat walls 42, 52 of each divided wall column 40, 50.
  • Use of the separated divided wall columns 40, 50 may allow for some freedom of movement that may be required by the temperatures and pressures that each divided wall column 40, 50 may experience without being directly affected by those of the other corresponding divided wall column.
  • the independent sections are free to move independently from each other in response to whatever mechanical stresses are resulting from temperature and pressure differences. Thus, the effect of the mechanical forces due to the temperature and pressure differences is largely eliminated except for the single area where divided wall column 40, 50 is attached to the shell column 60 and the vapor seal is created.
  • each divided wall column 40, 50 may be positioned proximate to each other such that the substantially flat walls 42, 52 of each divided wall column 40, 50 are in direct contact with each other.
  • the substantially flat walls 42, 52 of each divided wall column 40, 50 may be coupled to each other, for example.
  • the top of each divided wall column 40, 50 may be seal welded, for example. As illustrated in Figure 6, the divided wall columns 40, 50 inside the shell column
  • each divided wall column 40, 50 may include a liquid distributor 180.
  • the divided wall column 40, 50 may also include a feed nozzle 190 and a roof 200.
  • the divided wall columns 40, 50 may occupy non-equal portions of the total available area, for example. As illustrated in Figure 11 , a first divided wall column 40 may have a smaller area than a second divided wall column 50.

Abstract

A divided exchange column includes a cylindrical shell column (60) having a longitudinal axis and divided into two or more longitudinally extending part-cylindrical internal columns (40, 50), each said column being discretely preformed and having a respective part-cylindrical wall (44, 54) adjacent the cylindrical shell and terminating in two longitudinally extending edges and closed between said edges with one or more side walls (42,52).

Description

Divided Wall Columns for Smaller Sized Plants
The present invention relates to divided wall technology and provides an apparatus and method for facilitating the use of divided wall technology with smaller column diameters than are currently manufactured or used.
Traditional methods for building divided wall columns for use in heat and/or mass transfer processes require welding a dividing wall in an appropriate location directly to a pressure shell column and then proceeding with the installation of packing or distillation trays on either side of the divided wall column. Other methods for building divided wall columns require that half-cylindrical shells be welded onto the dividing wall itself. Both methods require a welder, working inside the pressure shell column, to place welds on the interior wall of the column and the dividing wall to prevent leaks between these members.
The previous methods of manufacture and designs of divided wall columns for smaller sized applications, however, are problematic for several reasons.
First, use of a divided wall column incorporating a traditional dividing wall subjects the dividing wall to both pressure and temperature differences on both sides of the divided wall column. These temperature and pressure differences arise due to the very nature of divided wall column operation. On either side of the dividing wall, different mass transfer conditions are created by the varying liquid and vapor flows through the column sections. These diverse mass transfer conditions yield different composition profiles along the length of the divided wall sections. The different composition vapors and liquids having distinct saturation temperatures thus create temperature differences on either side of the dividing wall.
The temperature differences create significant mechanical stresses on both the dividing wall as well as the pressure shell column, and as such, have to be carefully monitored and managed during plant operation. The pressure and temperature differences especially are significant during operating upsets, for example, during the startup or shut down of the facility. -iu
07245 PCT/P15828WO - 2 -
These upset conditions can be especially problematic when the operating temperatures of the column system deviate substantially from ambient conditions. For example, an air separation column operates under cryogenic conditions with temperatures reaching -195°C. At that temperature, care must be taken while cooling down the columns to ensure that both sides of the columns are cooled at a uniform rate (i.e., to prevent one column from cooling at a rate much faster than the opposite side of the column).
To combat these mechanical stresses, support members or stiffening members have been incorporated to prevent buckling, for example. As illustrated in U.S. Patent
No. 7,357,378, incorporated herein by reference in its entirety, these support members assist in withstanding the pressure differentials and minimizing the effect of the temperature differentials. Use of these support or stiffening members, however, may increase the cost and have a detrimental effect on the efficiency of the distillation process.
Increasing the thickness of the dividing wall to compensate for the mechanical stresses has also been attempted, however, the increase in strength realized is minimal, especially in columns having large diameters. Further, increasing the diameter of the dividing wall also leads to complications associated with the welding of the dividing wall to the column wall. Increasing the thickness of the dividing wall also causes occupation of a greater portion of the column area leading to less efficient use of the available area.
Use of double (laminated) or honeycombed walls, strengthening ribs, or using distillation trays as stiffeners to strengthen the dividing wall all suffer from the same drawbacks described above.
Second, with the increased demand for divided wall columns to be smaller, the space available for a welder to enter the pressure shell column and weld the dividing wall to the pressure shell column or the half-cylindrical shell to the dividing wall itself is problematic. For example, welding a dividing wall in columns with smaller diameters creates a measurably "tighter" clearance for the welder and welding tools to fit and work. In addition, welding shims, support members and/or stiffening members inside these small traditional divided wall columns is increasingly difficult. ifcu 9 / 0 0 7 1 9
07245 PCT/P15828WO - 3 -
The problem to which the present invention is directed is to provide an apparatus and method facilitating the use of divided wall technology with the specific advantage of providing for the production of smaller column diameters than are currently manufactured or used.
In one aspect, the invention provides a divided exchange column comprising a cylindrical shell having a longitudinal axis and divided into two or more longitudinally extending part-cylindrical internal columns characterized in that each of said internal columns is discretely preformed and has a respective part-cylindrical wall adjacent the cylindrical shell and terminating in two longitudinally extending edges and closed between said edges with one or more side walls.
In another aspect, the invention provides a method of constructing a divided exchange column of the first aspect comprising inserting into a cylindrical shell having a longitudinal axis two or more discretely preformed longitudinally extending part-cylindrical internal columns each having a respective part-cylindrical wall adjacent the cylindrical shell and terminating in two longitudinally extending edges and closed between said edges with one or more side walls.
There may be two complementary, preferably semi-cylindrical, internal columns each having the part-cylindrical wall closed along its open side with a substantially flat chordal side wall. When there are three or more internal columns, they usually will be complementary sectorial internal columns each having a part-cylindrical wall closed along its open side with a pair of mutually angularly inclined substantially flat side walls.
Opposed side walls of adjacent internal columns can be spaced apart or in contact.
The internal columns can contain distillation trays or structured packing. At least one of the internal columns can comprise at least one distillation tray and at least one other internal column can comprise structured packing. If an internal column contains distillation trays, the trays preferably do not directly contact the interior surfaces of the column but, for example, are arranged in a self supporting stack that hangs from the top of the column. At least one of the internal columns can be secured at its top to the shell and/or at least one of the internal columns can be secured at its bottom to the shell and/or at least one of the internal columns can be secured to the shell by a shear ring.
At least one of the internal columns can be of smaller cross section than at least one other internal column and/or can be of shorter length than at least one other internal column.
In one embodiment, a divided exchange column includes a cylindrical shell column having a first longitudinal axis and a cylindrical wall spaced apart from and surrounding the first longitudinal axis, thereby defining a first interior space between the cylindrical wall and the first longitudinal axis, wherein the cylindrical wall comprises an inner surface and an outer surface; a first divided wall column having a second longitudinal axis substantially parallel to the first longitudinal axis, a first wall, and a second wall, where the first wall of the first divided wall column is coupled to the second wall of the first divided wall column, and where the first wall of the first divided wall column is substantially flat and the second wall of the first divided wall column is substantially semi-cylindrical; a second divided wall column having a third longitudinal axis substantially parallel to the first and the second longitudinal axes, a first wall, and a second wall, where the first wall of the second divided wall column is coupled to the second wall of the second divided wall column, and where the first wall of the second divided wall column is substantially flat and the second wall of the second divided wall column is substantially semi-cylindrical; and where the first divided wall column and the second divided wall column are positioned in the first interior space of the cylindrical shell column such that the first wall of the first divided wall column is adjacent to the first wall of the second divided wall column and the second wall of the first divided wall column and the second wall of the second divided wall column are adjacent to the inner surface of the cylindrical wall.
The first wall of the first divided wall column and the first wall of the second divided wall column can define a slot therebetween, said slot extending from the first longitudinal axis to the inner surface of the cylindrical shell. The first divided wall column has a first length, and the second divided wall column has a second length. The first length of the first divided wall column and the second length of the second divided wall column may not be equal, for example.
The shell column may be pressurized or under vacuum conditions.
The thickness of the first wall of the first divided wall column may be 3 mm to 20 mm.
The first divided wall column may comprise at least one distillation tray and the second divided wall column comprise structured packing.
In yet another embodiment, a divided exchange column includes a first wall, where the first wall is substantially flat, a second wall, where the second wall is substantially semi-cylindrical and where the first wall and the second wall are coupled together such that the first wall and the second wall form a first exchange column with a cross-section that is substantially semi-cylindrical, a third wall, where the third wall is substantially flat, a fourth wall, where the fourth wall is substantially semi-cylindrical and where the third wall and the fourth wall are coupled together such that the third wall and the fourth wall form a second exchange column with a cross-section that is substantially semi-cylindrical, and a fifth wall, where the fifth wall is substantially cylindrical and forms a shell around the first exchange column and the second exchange column, and where the first wall of the first exchange column is adjacent and spaced from the third wall of the second exchange column.
In yet another embodiment, a divided exchange column comprises a first wall, where the first wall is substantially flat; a second wall, where the second wall is substantially semi-cylindrical and where the first wall and the second wall are coupled together such that the first wall and the second wall form a first exchange column; a third wall, where the third wall is substantially flat; a fourth wall, where the fourth wall is substantially semi-cylindrical and where the third wall and the fourth wall are coupled together such that the third wall and the fourth wall form a second exchange column; and a fifth wall, where the fifth wall is substantially cylindrical and forms a shell around the first exchange column and the second exchange column, and where the first wall of the first exchange column is adjacent and spaced apart from the third wall of the second exchange column.
The foregoing brief summary, as well as the following detailed description of exemplary embodiments, is better understood when read in conjunction with the appended drawings. For the purpose of illustrating embodiments of the invention, there is shown in the drawings exemplary embodiments of the invention; however, the invention is not limited to the specific methods and instrumentalities disclosed.
In the drawings:
Figure 1 is a schematic diagram illustrating a traditional divided wall column; Figure 2 is a schematic diagram illustrating an exemplary embodiment of the present invention;
Figure 3 is a schematic diagram illustrating an exemplary embodiment of the present invention;
Figure 4 is a schematic diagram illustrating an exemplary embodiment of the present invention;
Figure 5 is a schematic diagram illustrating an exemplary embodiment of the present invention; Figure 6 is a schematic diagram illustrating an exemplary embodiment of the present invention;
Figure 7 is a schematic diagram illustrating an exemplary embodiment of the present invention;
Figure 8a is a schematic diagram illustrating an exemplary embodiment of the present invention;
Figure 8b is an enlarged cross-sectional schematic diagram of an exemplary embodiment of the present invention;
Figure 9a is a schematic diagram illustrating an exemplary embodiment of the present invention; Figure 9b is an enlarged cross-sectional schematic diagram of an exemplary embodiment of the present invention;
Figure 10a is a schematic diagram illustrating an exemplary embodiment of the present invention;
Figure 10b is an enlarged cross-sectional schematic diagram of an exemplary embodiment of the present invention; and Figure 11 is a schematic diagram illustrating an exemplary embodiment of the present invention.
Figure 1 illustrates a known traditional divided wall column 10 where a dividing wall 20 is welded to column 30.
Figure 2 illustrates an embodiment of present invention where separate preformed divided wall columns 40, 50 may be constructed for use in a shell column 60. The shell column 60 may be pressurized, for example. The shell column 60 may also be under vacuum conditions, for example. The diameter of the shell column 60 may vary. For example, the diameter of the shell column 60 may be designed as a function of the design pressure. The shell column 60 may be cylindrical or substantially cylindrical, for example. The divided wall columns 40, 50 may be semi-cylindrical or substantially semi- cylindrical, for example.
In Figures 3-11 , elements that correspond to elements in the previously illustrated embodiments are identified by the same number. As illustrated in Figure 3, the divided wall columns 70, 80, 90 may also be substantially pie-shaped or substantially sectorial, for example, such that one or more divided wall columns may be positioned inside a shell column 60.
As further illustrated in Figure 2, a planar or flat wall 42, 52 of the divided wall column 40, 50 may be welded to the semi-cylindrical wall 44, 54 of the divided wall column 40, 50 from outside the divided wall column 40, 50. Space restrictions that occur when working from the inside of the divided wall column 40, 50 may be eliminated because the welding may be performed from outside the divided wall column 40, 50. The thickness of the flat wall 42, 52 may vary. The flat wall 42, 52 thickness may be 3 mm to 20 mm, for example.
As illustrated in Figures 2-4, each divided wall column 40, 50 (or 70, 80, 90 in
Figure 3) may have distillation trays 100 or packing 110 installed as appropriate. Distillation trays 100, disclosed in U.S. Patent No. 7,234,691 , which is herein incorporated by reference in its entirety, may be used, for example. The trays 100 do not directly contact the interior walls of the divided wall column as they may be installed as a stack of self-supporting trays that hang from the top, for example. Each divided wall column may be separately installed into the shell column 60, for example.
In one embodiment, the divided wall column may be secured to the shell column
60 at the top 120 of the divided wall column for example. In an alternative embodiment, the divided wall column may be secured to the shell column 60 at the bottom 130 of the divided wall column, for example. In another embodiment, a shear ring 140 may be used to affix the divided wall column to the shell column 60, for example.
In another embodiment, telescoping shoes or spacers 150 may be used to fix the relationship of the divided wall columns to the shell column 60 and each other.
Manufacturing the divided wall columns 40, 50, as illustrated in Figure 2, for example, may diminish the effect of the mechanical stresses created by the pressure and temperature differences that typically occur on either side of the dividing wall because the two divided wall columns no longer share a common dividing wall 20, as illustrated in
Figure 1. The divided wall columns 40, 50 may be positioned apart such that an open space or slot 170 may be defined between the substantially flat walls 42, 52 of each divided wall column 40, 50. Use of the separated divided wall columns 40, 50 may allow for some freedom of movement that may be required by the temperatures and pressures that each divided wall column 40, 50 may experience without being directly affected by those of the other corresponding divided wall column. The independent sections are free to move independently from each other in response to whatever mechanical stresses are resulting from temperature and pressure differences. Thus, the effect of the mechanical forces due to the temperature and pressure differences is largely eliminated except for the single area where divided wall column 40, 50 is attached to the shell column 60 and the vapor seal is created.
In yet another embodiment, and as illustrated in Figure 5, the divided wall columns
40, 50 may be positioned proximate to each other such that the substantially flat walls 42, 52 of each divided wall column 40, 50 are in direct contact with each other. In another embodiment, the substantially flat walls 42, 52 of each divided wall column 40, 50 may be coupled to each other, for example. The top of each divided wall column 40, 50 may be seal welded, for example. As illustrated in Figure 6, the divided wall columns 40, 50 inside the shell column
60 may have different lengths. For example, the length of first divided wall column 40 may be longer than the second divided wall column 50 because the specific separation requirements for the first divided wall column 40 may require more theoretical stages, for example. The lengths of the divided wall columns 40, 50 may also be substantially identical, as illustrated in Figure 7. As illustrated in Figures 6-1Ob, the divided wall columns 40, 50, may incorporate distillation trays 100, packing 110, or various combinations thereof. As illustrated in Figures 8a-10b, each divided wall column 40, 50 may include a liquid distributor 180. The divided wall column 40, 50 may also include a feed nozzle 190 and a roof 200.
In another embodiment, the divided wall columns 40, 50 may occupy non-equal portions of the total available area, for example. As illustrated in Figure 11 , a first divided wall column 40 may have a smaller area than a second divided wall column 50.
While aspects of the present invention has been described in connection with the preferred embodiments of the various figures, it is to be understood that other similar embodiments may be used or modifications and additions may be made to the described embodiment for performing the same function of the present invention without deviating therefrom. Therefore, the claimed invention should not be limited to any single embodiment, but rather should be construed in breadth and scope in accordance with the appended claims.

Claims

1. A divided exchange column comprising a cylindrical shell having a longitudinal axis and divided into two or more longitudinally extending part-cylindrical internal columns characterized in that each of said internal columns is discretely preformed and has a respective part-cylindrical wall adjacent the cylindrical shell and terminating in two longitudinally extending edges and closed between said edges with one or more side walls.
2. A divided exchange column of claim 1 , wherein there are two complementary internal columns each having the part-cylindrical wall closed along its open side with a substantially flat chordal side wall.
3. A divided exchange column of claim 2, wherein the internal columns are semi-cylindrical.
4. A divided exchange column of claim 1 , wherein there are three or more complementary sectorial internal columns each having a part-cylindrical wall closed along its open side with a pair of mutually angularly inclined substantially flat side walls.
5. A divided exchange column of any one of the preceding claims, wherein the opposed side walls of the adjacent internal columns are spaced apart.
6. A divided exchange column of any one of Claims 1 to 4, wherein the opposed side walls of the adjacent internal columns are in contact.
7. A divided exchange column of any one of the preceding claims, wherein at least one of said internal columns contains distillation trays arranged in a self supporting stack that hangs from the top of said column so that the trays do not directly contact the interior surfaces of the column.
8. A divided exchange column of any one of the preceding claims, wherein at least one of said internal columns is secured at its top or bottom to the shell. xu
07245 PCT/P15828WO - 11 -
9. A divided exchange column of any one of the preceding claims, wherein at least one of said internal columns is secured to the shell by a shear ring.
10. A divided exchange column of any one of the preceding claims, wherein at least one of said internal columns is of smaller cross-section than the at least one other said internal column.
11. A divided exchange column of any one of the preceding claims, wherein at least one of said internal columns is of shorter length than the at least one other said internal column.
12. A divided exchange column of any one of the preceding claims, wherein at least one of said internal columns comprises at least one distillation tray and wherein the at least one other internal column comprises structured packing.
13. A divided exchange column of Claim 1 , comprising: a cylindrical shell column having a first longitudinal axis and a cylindrical wall spaced apart from and surrounding the first longitudinal axis thereby defining a first interior space between the cylindrical wall and the first longitudinal axis, wherein the cylindrical wall comprises an inner surface and an outer surface; a first divided wall column having a second longitudinal axis substantially parallel to the first longitudinal axis, a first wall, and a second wall, wherein the first wall of the first divided wall column is coupled to the second wall of the first divided wall column, and wherein the first wall of the first divided wall column is substantially flat and the second wall of the first divided wall column is substantially semi-cylindrical; a second divided wall column having a third longitudinal axis substantially parallel to the first and the second longitudinal axes, a first wall, and a second wall, wherein the first wall of the second divided wall column is coupled to the second wall of the second divided wall column, and wherein the first wall of the second divided wall column is substantially flat and the second wall of the second divided wall column is substantially semi- cylindrical; and wherein the first divided wall column and the second divided wall column are positioned in the first interior space of the cylindrical shell column such that the first wall of the first divided wall column is adjacent to the first wall of the second divided wall column and the second wall of the first divided wall column and the second wall of the second divided wall column are adjacent to the inner surface of the cylindrical wall.
14. A divided exchange column of Claim 1 , comprising: a first wall, wherein the first wall is substantially flat; a second wall, wherein the second wall is substantially semi-cylindrical and wherein the first wall and the second wall are coupled together such that the first wall and the second wall form a first exchange column; a third wall, wherein the third wall is substantially flat; a fourth wall, wherein the fourth wall is substantially semi-cylindrical and wherein the third wall and the fourth wall are coupled together such that the third wall and the fourth wall form a second exchange column; and a fifth wall, wherein the fifth wall is substantially cylindrical and forms a shell around the first exchange column and the second exchange column, and wherein the first wall of the first exchange column is adjacent and spaced apart from the third wall of the second exchange column.
15, A method of constructing a divided exchange column of Claim 1 comprising inserting into a cylindrical shell having a longitudinal axis two or more discretely preformed longitudinally extending part-cylindrical internal columns each having a respective part-cylindrical wall adjacent the cylindrical shell and terminating in two longitudinally extending edges and closed between said edges with one or more side walls.
PCT/IB2009/007199 2008-10-22 2009-10-20 Divided wall columns for smaller sized plants WO2010046764A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011064580A3 (en) * 2009-11-24 2011-09-01 Doosan Power Systems Limited Column internal support structure

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2161063B1 (en) * 2008-09-03 2016-11-02 L'Air Liquide Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude Method for fabricating divided wall columns
GB201019920D0 (en) 2010-11-24 2011-01-05 Doosan Power Systems Ltd Column
WO2013043195A1 (en) * 2011-09-23 2013-03-28 Uop Llc Dividing wall column
KR20140140573A (en) * 2012-03-06 2014-12-09 에어 프로덕츠 앤드 케미칼스, 인코오포레이티드 Structured packing
CN102657949B (en) * 2012-05-09 2013-03-06 河北工业大学 Method for increasing thermodynamic efficiency of dividing wall column and dividing wall column
US9644890B2 (en) 2013-03-01 2017-05-09 Praxair Technology, Inc. Argon production method and apparatus
US9187194B2 (en) * 2013-05-24 2015-11-17 L'Air Liquide Société Anonyme Pour L'Étude Et L'Exploitation Des Procedes Georges Claude System for distributing the weight of a column section
CN105457324B (en) * 2014-08-20 2019-12-27 科思创德国股份有限公司 Baffle rectifying tower
US9676629B2 (en) 2015-06-09 2017-06-13 Praxair Technology, Inc. Helium enhanced heat transfer in adsorptive liquid or gas phase argon purification processes
US10012437B2 (en) 2015-07-31 2018-07-03 Praxair Technology, Inc. Method and apparatus for argon recovery in a cryogenic air separation unit integrated with a pressure swing adsorption system
US10018413B2 (en) 2015-07-31 2018-07-10 Praxair Technology, Inc. Method and apparatus for increasing argon recovery in a cryogenic air separation unit integrated with a pressure swing adsorption system
US10066871B2 (en) 2015-07-31 2018-09-04 Praxair Technology, Inc. Method and apparatus for argon rejection and recovery
US10012438B2 (en) 2015-07-31 2018-07-03 Praxair Technology, Inc. Method and apparatus for argon recovery in a cryogenic air separation unit integrated with a pressure swing adsorption system
DE102015014676A1 (en) * 2015-11-16 2017-06-01 Julius Montz Gmbh Column with cylindrical partition
EP3424590A1 (en) * 2017-07-07 2019-01-09 Linde Aktiengesellschaft Package for material and/or energy exchange with separate packaging units
US10578357B2 (en) 2017-08-25 2020-03-03 Praxair Technology, Inc. Annular divided wall column with ring shaped collectors and distributers for an air separation unit
US10684071B2 (en) 2017-08-25 2020-06-16 Praxair Technology, Inc. Annular divided wall column for an air separation unit
EP3687650A1 (en) 2017-09-28 2020-08-05 ExxonMobil Research and Engineering Company Dual-dividing wall column with multiple products
CN111344049B (en) * 2017-11-14 2022-07-29 科氏-格利奇有限合伙公司 Mass transfer assembly and column with dividing wall and methods involving same
US11262125B2 (en) 2018-01-02 2022-03-01 Praxair Technology, Inc. System and method for flexible recovery of argon from a cryogenic air separation unit
US11207611B1 (en) 2018-07-03 2021-12-28 Burns & Mcdonnell Engineering Company, Inc. Process for separating hydrocarbons in a liquid feed utilizing an externally heated reboiler connected to a divided wall column as the primary source of heat energy
CN112689662B (en) 2018-09-14 2024-02-06 埃克森美孚科技工程公司 Advanced process control scheme for divided wall columns and double divided wall columns with multiple products

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5585046A (en) * 1993-10-29 1996-12-17 Julius Montz Gmbh Column for performing thermal separations and/or chemical reactions
FR2776206A1 (en) * 1998-03-19 1999-09-24 Air Liquide Air distillation device, particularly for producing argon
EP1108965A1 (en) * 1999-12-13 2001-06-20 Air Products And Chemicals, Inc. Process for distillation of multicomponent fluid suitable for production of an argon-enriched stream from a cryogenic air separation process
US20030047438A1 (en) * 1998-05-06 2003-03-13 Sumitomo Heavy Industries, Ltd. Distillation apparatus and distillation method
US7234691B2 (en) * 2005-05-20 2007-06-26 Air Products And Chemicals, Inc. Radial-crossflow distillation trays for divided wall column applications
US7357378B2 (en) * 2004-10-18 2008-04-15 Air Prodcuts And Chemicals, Inc. Divided wall exchange column

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4681661A (en) * 1983-10-14 1987-07-21 Rakesh Govind Dual distillation columns
US4615770A (en) * 1983-10-14 1986-10-07 Rakesh Govind Distillation column and process
US5339648A (en) * 1993-08-05 1994-08-23 Praxair Technology, Inc. Distillation system with partitioned column
DE4328424A1 (en) * 1993-08-24 1995-03-02 Basf Ag Distillation column for separating a liquid mixture into several pure fractions
DE4336986C2 (en) 1993-10-29 2001-09-13 Montz Gmbh Julius Column with partition
DE19520802C2 (en) * 1995-06-07 1999-04-01 Linde Ag Annular means for the edge sealing of a mass transfer column filled with an ordered packing
US5755933A (en) * 1995-07-24 1998-05-26 The M. W. Kellogg Company Partitioned distillation column
DE19617210A1 (en) * 1996-04-30 1997-11-06 Basf Ag Partition wall column for the continuous separation of multi-component mixtures by distillation
GB9714093D0 (en) 1997-07-03 1997-09-10 M W Kellogg Limited Improvements in or relating to distillation columns for fractionation
DE10021624A1 (en) * 2000-05-04 2001-11-08 Basf Ag Partition column
JP2002159801A (en) * 2001-10-09 2002-06-04 Kyowa Yuka Co Ltd Joining type distillation column

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5585046A (en) * 1993-10-29 1996-12-17 Julius Montz Gmbh Column for performing thermal separations and/or chemical reactions
FR2776206A1 (en) * 1998-03-19 1999-09-24 Air Liquide Air distillation device, particularly for producing argon
US20030047438A1 (en) * 1998-05-06 2003-03-13 Sumitomo Heavy Industries, Ltd. Distillation apparatus and distillation method
EP1108965A1 (en) * 1999-12-13 2001-06-20 Air Products And Chemicals, Inc. Process for distillation of multicomponent fluid suitable for production of an argon-enriched stream from a cryogenic air separation process
US7357378B2 (en) * 2004-10-18 2008-04-15 Air Prodcuts And Chemicals, Inc. Divided wall exchange column
US7234691B2 (en) * 2005-05-20 2007-06-26 Air Products And Chemicals, Inc. Radial-crossflow distillation trays for divided wall column applications

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011064580A3 (en) * 2009-11-24 2011-09-01 Doosan Power Systems Limited Column internal support structure
US8960652B2 (en) 2009-11-24 2015-02-24 Doosan Babcock Limited Column internal support structure

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EP2340094A1 (en) 2011-07-06
US8480860B2 (en) 2013-07-09
EP2340094B1 (en) 2019-05-15
US20100096249A1 (en) 2010-04-22
TW201017025A (en) 2010-05-01
CN102186548A (en) 2011-09-14

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